clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `query_cache.max_entry_size_in_rows` ignored due to config key typo
- Web UI categorical coloring misreads selected `JSON` cell's pretty-printed text
- Shard names a >1 MiB literal `_CAST(_CAST(...))`: distributed header mismatch
- Fix `UNKNOWN_ELEMENT_OF_ENUM` in `if`, `ifNull` and `coalesce` with `Nullable(Enum)`
- Deserialize only the rows that passed PREWHERE for Array and Map columns
- Optimize ilike and like performance
- Overlay database with an Overlay source breaks system.tables server-wide
- EXPLAIN ANALYZE spills DISTINCT early under query memory limit
- Iceberg OPTIMIZE resurrects rows removed by DROP PARTITION
- Two `bucketed` `metric_log` generations break `merge()` and the dashboards
- Docs
- C++ not yet supported